20-mm Survey Bibliography Bibliographies for category R3-20mmSurvey and sub category Damon, L. and V. Mora 2022. 2022 20-mm Survey Delta Smelt Index, CDFW (112 KB) Mora, V. 2024. 2024 20-mm Survey Delta Smelt Index, CDFW (75 KB) Mora, V. 2024. 2023 20-mm Survey Delta Smelt Index, CDFW (86.7 KB) Trinh Nguyen 2022. Changes to 20-mm Index Calculation , CDFW (274 KB)